What is the difference between single quote strings and double quote strings?

Answer 1

As no language is mentioned so I will assume it to be python

The answer is that there is no difference between single quote and double quote string.

Answer 2

Depends on the language. It is much different e.g. in C++ and PHP

Answer 3

Syntactically there is no difference any quote can be used for any string .
But If your string has single quote between characters Prefer using double quote for quoting string and vice versa it's just.

Answer 4

In some languages like Go, C++ and Java. There is a difference. Single quote indicates a character. Double quote indicates a string.

In PHP, string interpolation can not be done with single quoted strings.

In some other languages like JavaScript and Python, it does not matter.